IOTA/IOTA-ES occultation update for (28) Bellona / UCAC4 452-001011 event on 2023 Jun 21, 03:26 UT Visible from S Africa Summary ------- On 2023 Jun 21 UT, the 116 km diameter asteroid (28) Bellona will occult a 12.0 mag star in the constellation Cetus for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.48 mag to 13.16 mag (the magnitude of the asteroid) for at most 5.240 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2023 Jun 21, 03:22 - 2023 Jun 21, 03:30 * geocentric midpoint of event [JD]: 2460116.64329029 * magnitude of target star: 12.00 * magnitude drop [mag]: 1.48 * estimated maximum duration [s]: 5.240 * Moon: 8 % sunlit, 112° distance * Sun: 78° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 133 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.009", 74°) * approx speed of asteroid's shadow [km/s]: 22.1336 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 452-001011 by 28 Bellona on 2023 Jun 21 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 37 0 0 -41 35 41 3 22 8.9 0 89 -69 -42 11 43 -40 59 51 -42 24 46 -40 46 58 .... - 36 0 0 -41 35 4 3 22 8.9 1 89 -68 -42 11 6 -40 59 14 -42 24 9 -40 46 21 0.33 - 35 0 0 -41 34 16 3 22 9.0 2 88 -68 -42 10 18 -40 58 26 -42 23 21 -40 45 33 0.43 - 34 0 0 -41 33 16 3 22 9.2 2 87 -67 -42 9 18 -40 57 26 -42 22 22 -40 44 33 0.47 - 33 0 0 -41 32 5 3 22 9.4 3 87 -67 -42 8 7 -40 56 15 -42 21 11 -40 43 22 0.49 - 32 0 0 -41 30 42 3 22 9.7 4 86 -66 -42 6 44 -40 54 52 -42 19 48 -40 41 58 0.50 - 31 0 0 -41 29 7 3 22 10.0 5 85 -66 -42 5 10 -40 53 17 -42 18 14 -40 40 24 0.51 - 30 0 0 -41 27 21 3 22 10.4 5 85 -65 -42 3 25 -40 51 31 -42 16 29 -40 38 37 0.51 - 29 0 0 -41 25 24 3 22 10.8 6 84 -65 -42 1 28 -40 49 33 -42 14 32 -40 36 39 0.52 - 28 0 0 -41 23 15 3 22 11.3 7 83 -64 -41 59 19 -40 47 24 -42 12 23 -40 34 30 0.52 - 27 0 0 -41 20 54 3 22 11.9 8 83 -64 -41 56 59 -40 45 3 -42 10 3 -40 32 9 0.53 - 26 0 0 -41 18 22 3 22 12.5 8 82 -63 -41 54 27 -40 42 30 -42 7 32 -40 29 36 0.53 - 25 0 0 -41 15 39 3 22 13.2 9 81 -62 -41 51 44 -40 39 46 -42 4 49 -40 26 52 0.53 - 24 0 0 -41 12 44 3 22 13.9 10 81 -62 -41 48 50 -40 36 50 -42 1 54 -40 23 56 0.53 - 23 0 0 -41 9 37 3 22 14.7 11 80 -61 -41 45 44 -40 33 43 -41 58 49 -40 20 49 0.53 - 22 0 0 -41 6 19 3 22 15.5 11 79 -61 -41 42 26 -40 30 25 -41 55 31 -40 17 30 0.53 - 21 0 0 -41 2 50 3 22 16.4 12 79 -60 -41 38 57 -40 26 55 -41 52 3 -40 14 0 0.54 - 20 0 0 -40 59 9 3 22 17.4 13 78 -59 -41 35 17 -40 23 13 -41 48 23 -40 10 18 0.54 - 19 0 0 -40 55 16 3 22 18.4 14 77 -59 -41 31 25 -40 19 20 -41 44 31 -40 6 24 0.54 - 18 0 0 -40 51 13 3 22 19.5 15 77 -58 -41 27 22 -40 15 15 -41 40 29 -40 2 20 0.54 - 17 0 0 -40 46 57 3 22 20.6 15 76 -57 -41 23 8 -40 10 59 -41 36 15 -39 58 3 0.54 - 16 0 0 -40 42 31 3 22 21.8 16 75 -57 -41 18 42 -40 6 32 -41 31 49 -39 53 36 0.54 - 15 0 0 -40 37 53 3 22 23.0 17 74 -56 -41 14 5 -40 1 53 -41 27 12 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0 0 -16 53 24 3 30 30.9 5 272 49 -17 29 32 -16 17 29 -17 42 38 -16 4 34 0.61 136 0 0 -16 52 44 3 30 31.3 4 272 49 -17 28 52 -16 16 49 -17 41 57 -16 3 54 0.63 137 0 0 -16 52 19 3 30 31.6 3 271 49 -17 28 26 -16 16 24 -17 41 31 -16 3 29 0.65 138 0 0 -16 52 8 3 30 31.9 2 271 49 -17 28 15 -16 16 13 -17 41 21 -16 3 18 0.69 139 0 0 -16 52 12 3 30 32.0 1 271 48 -17 28 19 -16 16 17 -17 41 25 -16 3 23 0.81 140 0 0 -16 52 31 3 30 32.1 0 270 48 -17 28 38 -16 16 36 -17 41 43 -16 3 42 3.90 Uncertainty in time = +/- 2 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 452-001011 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 46 31.0179 DE: +00 18 29.804 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 46 31.0180 DE: +00 18 29.804 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (28) Bellona asteroid class: approx. diameter [km]: 116 approx. diameter ["]: 0.052 distance from Earth [AU]: 3.07960 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#125 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.016", 0.009", 73.889° remarks: * orbital elements for (28)Bellona : Mean anomaly = 237.1099667096 deg Arg. of pericenter = 343.6320805983 deg Long. of node = 144.2847020086 deg Inclination = 9.4268007472 deg Eccentricity = 0.1507255326 Semimajor axis = 2.7769008020 AU Perihelion dist = 2.3583509497 AU Mag: H = 7.27, G = 0.15 Epoch of elements : MJD 60116.14326389 TDT (2023 Jun 21.1433) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1252023Apr24,5.24,2023,6,21,3.438967,0.103527,-0.474572,12.206091,2.661299,-0.005058,-0.002238,0.000000,0.000000 51.2661,0.4356,128.85,23.44,False UCAC4 452-001011,0.77528273,0.3082787,0.00,12.00,0.00,0.0,0,,0.79511314,0.4355990,1.48,0.00,0,0,0 28,Bellona,13.16,116.0,3.0796,0,0,2.324,7.60,,6.4,0 0,237.0795,2023,6,21,343.6321,144.2847,9.4268,0.15073,2.77690,2.35835,7.33,5.0,0.15 1.180,0.0157,0.0093,74,0.0094,Known errors,-1.00,-1,-1,-1 20230621_001011,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org